Lennox 54G44 Enthalpy Sensor

The Lennox 54G44 Enthalpy Sensor is a critical OEM component designed for high-precision environmental monitoring in commercial HVAC systems. Also referenced under part numbers 54G4401 and C7400A1038, this analog enthalpy sensor integrates with economizer logic modules to evaluate both sensible and latent heat. By delivering a standard 4 to 20 mA output signal, it enables the controller to determine if outdoor air is suitable for free cooling, effectively optimizing building efficiency and reducing mechanical cooling loads. This solid-state sensor is engineered for differential enthalpy control applications, where two units are used to compare return air and outdoor air conditions. Its robust construction ensures long-term stability in air-handling units and rooftop systems, resisting the effects of humidity variations that often compromise lower-grade sensors. For technicians performing Lennox HVAC maintenance or economizer repairs, this genuine replacement enthalpy sensor ensures Honeywell C7400A1038 compatibility and maintains the original performance curves (A, B, C, and D) required for precise dampering and ventilation control.

• Optimized Free Cooling: Enables the system to utilize outdoor air for cooling when enthalpy levels are lower than the return air, significantly reducing compressor runtime.
• Precise 4-20 mA Signal: Provides accurate, linearized data to economizer logic modules for reliable damper positioning and energy management.
• HVAC System Protection: Helps prevent the intake of high-humidity air, protecting internal components and improving indoor air quality.
• Universal OEM Fit: Drop-in replacement for Lennox 54G44 and Honeywell C7400A1038, ensuring seamless connectivity with existing 1/4 inch quick-connect terminals.

Common Questions

Can the 54G44 be used for differential enthalpy sensing?
Yes. For differential enthalpy control, you must install two 54G44 sensors—one in the outdoor air intake and one in the return air duct—to allow the controller to compare energy levels between the two air streams.

Is this sensor compatible with all economizer controllers?
The 54G44 (C7400A1038) is specifically designed for use with logic modules that accept a 4 to 20 mA signal, such as the Honeywell W7212 and W7459 series, and standard Lennox commercial controllers.

Does this sensor require field calibration?
No, these units are factory-calibrated to follow specific performance curves. Proper operation relies on correct placement in freely circulating air, away from direct sunlight or moisture sources.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.